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// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package base
import (
"flag"
"fmt"
"cmd/go/internal/cfg"
"cmd/go/internal/fsys"
"cmd/internal/quoted"
)
// A StringsFlag is a command-line flag that interprets its argument
// as a space-separated list of possibly-quoted strings.
type StringsFlag []string
func (v *StringsFlag) Set(s string) error {
var err error
*v, err = quoted.Split(s)
if *v == nil {
*v = []string{}
}
return err
}
func (v *StringsFlag) String() string {
return "<StringsFlag>"
}
// explicitStringFlag is like a regular string flag, but it also tracks whether
// the string was set explicitly to a non-empty value.
type explicitStringFlag struct {
value *string
explicit *bool
}
func (f explicitStringFlag) String() string {
if f.value == nil {
return ""
}
return *f.value
}
func (f explicitStringFlag) Set(v string) error {
*f.value = v
if v != "" {
*f.explicit = true
}
return nil
}
// AddBuildFlagsNX adds the -n and -x build flags to the flag set.
func AddBuildFlagsNX(flags *flag.FlagSet) {
flags.BoolVar(&cfg.BuildN, "n", false, "")
flags.BoolVar(&cfg.BuildX, "x", false, "")
}
// AddChdirFlag adds the -C flag to the flag set.
func AddChdirFlag(flags *flag.FlagSet) {
// The usage message is never printed, but it's used in chdir_test.go
// to identify that the -C flag is from AddChdirFlag.
flags.Func("C", "AddChdirFlag", ChdirFlag)
}
// AddModFlag adds the -mod build flag to the flag set.
func AddModFlag(flags *flag.FlagSet) {
flags.Var(explicitStringFlag{value: &cfg.BuildMod, explicit: &cfg.BuildModExplicit}, "mod", "")
}
// AddModCommonFlags adds the module-related flags common to build commands
// and 'go mod' subcommands.
func AddModCommonFlags(flags *flag.FlagSet) {
flags.BoolVar(&cfg.ModCacheRW, "modcacherw", false, "")
flags.StringVar(&cfg.ModFile, "modfile", "", "")
flags.StringVar(&fsys.OverlayFile, "overlay", "", "")
}
func ChdirFlag(s string) error {
// main handles -C by removing it from the command line.
// If we see one during flag parsing, that's an error.
return fmt.Errorf("-C flag must be first flag on command line")
}